Cloud-AWS-S3-With-Spring-Boot-Assignment-3

• First, I create a bucket on AWS S3, then I create an access key.
• I install AWS Toolkit on Intellij, then set bucket access and secret keys and the region in application.properties file, which this tool will configure AWS configuration and make an access to the S3 service.

cloud.aws.credentials.accessKey= XXXXXXXXXXXX
cloud.aws.credentials.secretKey= XXXXXXXXXXXXXXXXXXXXXX
cloud.aws.region.static=eu-west-2
server.port=8082

• I set an AWS SDK S3 dependency on pom.xml and other required dependencies.

<dependency>
	<groupId>com.amazonaws</groupId>
	<artifactId>aws-java-sdk-s3</artifactId>
	<version>1.12.429</version>
</dependency>

• Configure amazons3 bean on AmazonS3Configuration class

@Bean
    public AmazonS3 amazonS3() {
        try {
            BasicAWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);
            AmazonS3ClientBuilder builder = AmazonS3ClientBuilder.standard()
                    .withCredentials(new AWSStaticCredentialsProvider(credentials))
                    .withRegion(region);
            return builder.build();
        } catch (Exception e){
            System.out.println(Arrays.toString(e.getStackTrace()));
            return null;
        }
    }

Create an endpoints

• Upload endpoint: which is used to upload a file or image by send them as a parameter then store it in the bucket using http://localhost/aws/upload

@PostMapping("/upload")
    public String uploadFile(@RequestParam("file") MultipartFile file) {
        try {
            amazonS3.putObject(BUCKET_NAME, IMAGE_DIRECTORY_NAME + file.getOriginalFilename(), file.getInputStream(), null);
            return "File uploaded successfully!";
        } catch (IOException e) {
            return "Error uploading file.";
        }
    }

• Download endpoint: which is used to download a file or image byte by byte by send it's name with the request using http://localhost/aws/download/img.png

@GetMapping("/download/{fileName}")
    public ResponseEntity<byte[]> downloadFile(@PathVariable("fileName") String fileName) {
        S3Object s3Object = amazonS3.getObject(BUCKET_NAME, IMAGE_DIRECTORY_NAME + fileName);
        InputStream inputStream = s3Object.getObjectContent();
        byte[] bytes;
        try {
            bytes = IOUtils.toByteArray(inputStream);
        } catch (IOException e) {
            return ResponseEntity.notFound().build();
        }
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        headers.setContentDisposition(ContentDisposition.builder("attachment").filename(fileName).build());
        return new ResponseEntity<>(bytes, headers, HttpStatus.OK);
    }

• List all files endpoint: which is used to list all files or images in the image/ directory using http://localhost/aws/download/img.png

@GetMapping("/files")
    public List<String> getFileList() {
        try {
            ObjectListing objectListing = amazonS3.listObjects(BUCKET_NAME, IMAGE_DIRECTORY_NAME);
            List<String> files = new ArrayList<>();
            for (S3ObjectSummary os : objectListing.getObjectSummaries()) {
                files.add(os.getKey().substring(os.getKey().lastIndexOf("/") + 1));
            }
            return files;
        } catch (Exception e){
            System.out.println(e.getStackTrace());
            return null;
        }
    }

• You can find a simple demo for app Here

To Deploy the application on an EC2 instance

• Create an EC2 instance
• Install java on the instance
• Install Tomcat server
• Build a spring boot app
• Then move the app on it and set the requierd configs for maven
• Set requierd security group configs
• Run the app
• Test the app